Publish Time: 2025-04-14 Origin: Site
| | 1.Introduction |
Refined naphthalene (C₁₀H₈) is a high-purity crystalline aromatic hydrocarbon derived primarily from coal tar distillation. With its distinctive white flake/powder form and characteristic odor, this versatile chemical serves as a crucial building block in numerous industrial applications. The global market for refined naphthalene continues to demonstrate steady growth,
| | 2.Key Specifications |
| Refined Naphthalene (Top Quality Goods) | ||
| NO. | Item | Result |
| 1 | Appearance | White |
| 2 | Crystallization Point | 79.88 |
| 3 | Ash Content | 0.006 |
| 4 | Non-volatile Matter Content | 0.01 |
| 5 | Color Number of Acid Washing Color Comparison | 2 |
| 6 | Naphthalene Content | 99.45 |
| | 3.Manufacturing Process |
The production of refined naphthalene involves sophisticated processing stages:
3.1 Raw Material Preparation**
Coal tar feedstock undergoes preliminary treatment to remove particulate matter and water content. Advanced filtration systems ensure optimal input quality.
3.2 Primary Distillation**
Fractional distillation occurs in temperature-controlled columns (200-220°C range) to separate naphthalene from other coal tar components like creosote and anthracene.
3.3 Crystallization & Purification**
The distilled product undergoes controlled crystallization (0.5-1°C/min cooling rate) followed by centrifugal separation to achieve desired purity levels.
3.4 Final Processing**
The crystallized product is dried (60-80°C) and packaged under inert atmosphere to prevent oxidation and moisture absorption.
| | 4. Industrial Applications |
4.1 Chemical Intermediate**
- Phthalic anhydride production (70% of global consumption)
- Dye and pigment manufacturing
- Surfactant synthesis (alkyl naphthalene sulfonates)
4.2 Specialty Applications**
- Rubber antioxidants (TMQ production)
- Pharmaceutical intermediates (sulfonamide drugs)
- High-performance concrete plasticizers
| | 5. Safety & Handling Protocols |
Proper safety measures are essential due to naphthalene's:
- Flammability (Flash point: 79°C)
- Sublimation characteristics
- Potential health effects (hemolytic anemia risk)
Storage Requirements:**
- Maintain below 30°C in sealed containers
- Use explosion-proof electrical equipment
- Implement proper ventilation systems
| | 6. Environmental Considerations |
Considerations**
Modern production facilities must comply with:
- Wastewater treatment (COD ≤100mg/L)
- VOC emission controls (≤50mg/m³)
- REACH and EPA regulatory standards
- Closed-loop recycling systems for byproducts